var History = function History(){
    throw new TypeError("Illegal constructor");
};catvm.safefunction(History);

Object.defineProperties(History.prototype,{
    [Symbol.toStringTag]:{
        value:"History",
        configurable:true
    }
});
//////////
History.prototype.back = function back(){debugger};
catvm.safefunction(History.prototype.back);
/////////
history = {};
history.__proto__ = History.prototype;

history = catvm.proxy(history);